IEEE 802.11ac, also known as WiFi 5, is designed to operate exclusively over the 5GHz frequency band, offering advantages such as less interference and higher data rates compared to the 2.4GHz band. The statement is false because 802.11ac does not use the 2.4GHz band, which is commonly associated with earlier standards such as 802.11b/g/n. It is important for networking professionals to know the correct frequencies associated with different wireless standards to ensure proper network design and compatibility.